One of the best modern books on the subject of Necromancy isCommuning With The Spirits by Martin Coleman. The gist of Coleman’s work is for the practitioner to get back in touch with your own Ancestors. All this involves is simply setting up a small shrine to them & regularly offering them an anointed white candle and a clear glass of pure water every day. Coleman has some very practical ideas on contacting the other side and NONE of them involve digging up skeletal remains. Truly his work is a gem for the modern practitioner of Necromancy. I personally, have read this book and enjoyed his step-by-step method.
If you’re interested in the “Cults of the Dead”, some of the best stuff is on the Religio-Magical practices of Palo Monte & Palo Mayombe. This involves creating a Nganga (or in Santeria it’s called a Prenda) which is a big ol’ cast iron pot into which you put many things associated with the dead. This creates a home for the deceased spirit to live in that will become your personal familiar.
Of course there aren’t that many books out there on this subject, however you can find Carlos Montenegro’s Palo Mayombe which purports to tell you what exactly you need in a Nganga but many Paleros say that Montenegro’s book is full of bull and lacking any real knowledge. Montenegro does not tell you enough information – key info is left out thus you are forced to find an expert/practitioner in the field to fill in the missing gaps such as which palos (tree sticks) are from which trees and how to make the Nganga or Prenda.
Blood Sorcery Bible Volume 1: Rituals in Necromancy by Sorceress Cagliastro was also one of my favorite books on necromancy, as I use blood as an offering to the spirits already, so her book offered a different perspective on collection of the blood, and the connection to the spirit world. The most annoying part of reading this book, was her lack of detail when it came to explaining the most important part of her workings. She says to “contact me and I will tell you what to do” however, she has not returned a single email to me yet! That causes me to doubt her authenticity. She continues to say she offers more detail in her other books, but as I said in my email to her, I brought Blood Sorcery to have access to the information stated on the book cover, and not to buy other book to gain the information. Overall, reading of her personal relationships with the spirits is interesting.
I don’t recommend any book by Joseph H. Peterson, who provides nothing more than a copy of other works, and then claim the work as his own. All his book content is found for free online.